1969 175 p., num. figs & photographs, paperbound + 19 enclosures including one large folded col. map in separate slip case. Published in: Verhandelingen Koninklijk Nederlands geologisch-Mijnbouwkundig Genootschap.
1969 175 p., num. figs & tables, maps in separate slipcase.
1960-1966 180 p., num. figs, wrps (reprints from Leidse Geol. Meded.).
1974 159 p., paperbound. Vol. 53#6 of Geologie en Mijnbouw, completely devoted to Prequaternary, Pleistocene, Holocene palaeobotany. Contains 12 papers.